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TLV62568: Issue with buck converter at low temperatures

Marc van 't Hul
Prodigy 30 points
Part Number: TLV62568

Hello,

I am testing the TLV62568 buck converter and have encountered an issue with low temperatures. When the temperature drops below 0 degrees, the buck converter stops working. However, when I put my finger on the PCB (front or back), the buck converter starts working again.

Could someone please provide some insights into what might be causing this issue? Is there a way to solve this problem?

Thank you in advance for your help!

  • 0
    TI__Genius 16530 points

    Hello 

    Thank you are reaching out,

    Generally TLV62568 can be operated at a junction temperature of -40 to 125 °C. so there should not be any problem with the device operation.

    Can you please provide me the waveforms plotting  Vin(at the device input capacitor), Vout(at the device ouput capacitor) and SW node voltage at 0 °C all in same scope.

    Thank you,

    Regards,

    Moheddin.

  • 0 in reply to Moheddin Pasha Shaik
    TI__Genius 16530 points

    Hello,

    Do you have any updates?

    Regards,

    Moheddin.

  • +1 in reply to Moheddin Pasha Shaik
    Prodigy 30 points

    Hello Moheddin,

    Thank you for the suggestions to troubleshoot this issue.

    Unfortunately, the problem was a bit silly after some research. I discovered that the problem was not with the buck converter itself, but with the UVLO circuit that I had added to the enable pin. It turns out that the UVLO circuit was temperature dependent (which should not have been), and that was causing the buck converter to stop working at low temperatures.

    Regards,

    William

  • 0 in reply to Marc van 't Hul
    TI__Genius 16530 points

    Hello William,

    Thank you for the update.

    If you don't have any further can you please close the thread by clicking on Resolved.

    Thank you,

    Regards,

    Moheddin.